<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
 <style>
#a000 { width:700px; }
 #a001 { width:700px; height:200px; background-color:#F00; margin-bottom:10px}


  #a002 { width:200px; height:600px; background-color:#3CF; float:left; margin-right:10px;}

  #a003 { width:490px; height:600px; background-color:#0F0; float:left; }

  
  
 </style>
</head>

<body>
<center><div id="a000">
<div id="a001"><div class="b001"></div><div class="b002">

</div></div>
<div id="a002">

</div>
<div id="a003">

</div>
</div></center>
</body>
</html>
